Sparing with resources (6)
I believe the answer is:
frugal
'sparing with resources' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for frugal that I've seen before include "'Sparing, economical (6)'" , "not extravagant" , "Economical, avoiding waste" , "'Thrifty, avoiding waste (6)'" , "Abstemious" .)